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    Name:  1446579311282-523149246.jpg
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Size:  320.1 KBCan anyone pls explain how to do this question. I tried to do it using the circle but it is not right and it would be great if u could also explain how to use the graph to solve this. I am stuck because I thinkat the end you divide all the solution by 2 then -15 right? Thanks
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    Anyone???
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    (Original post by coconut64)
    Name:  1446579311282-523149246.jpg
Views: 103
Size:  320.1 KBCan anyone pls explain how to do this question. I tried to do it using the circle but it is not right and it would be great if u could also explain how to use the graph to solve this. I am stuck because I thinkat the end you divide all the solution by 2 then -15 right? Thanks
    Your working looks correct so far. Just remember there will be a few results.
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    Isn't the range meant to be 15<=2x+15<=735
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    (Original post by Albus Hagrid)
    Isn't the range meant to be 15<=2x+15<=735
    My teacher told me to do that right at the end so you would get your solution, divide it by 2 then minus 15. But my answers are wrong...
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    (Original post by Andy98)
    Your working looks correct so far. Just remember there will be a few results.
    So the first solution I got is 64.63 and I divided it by 2 and -15 but when I sub it in it doesn't equal to 2....
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    (Original post by coconut64)
    My teacher told me to do that right at the end so you would get your solution, divide it by 2 then minus 15. But my answers are wrong...
    \tan(2x+15)=2 for 0&lt;x&lt;360

    Let \theta = 2x+15

    Solve for \theta


    What do you get for those stages?
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    (Original post by Andy98)
    \tan(2x+15)=2 for 0&lt;x&lt;360

    Let \theta = 2x+15

    Solve for \theta


    What do you get for those stages?
    Thanks so much! I got it now, so does 2x+15 or whatever inside the bracket represent theta?
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    (Original post by coconut64)
    Thanks so much! I got it now, so does 2x+15 or whatever inside the bracket represent theta?
    Yes.
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    (Original post by Andy98)
    Yes.
    Thanks. I appreciate the help
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    (Original post by coconut64)
    Thanks. I appreciate the help
    No problem :hat2:
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    (Original post by Andy98)
    No problem :hat2:
    Hi again, if you have yo solve sin^2x=1, do you factorise it or square root it? Thanks
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    Hey. I got 4 solutions? 294.1, 204.2, 114.2 and 24.2. I may be wrong, I haven't done this since my exams lool
    I believe this is CAST and there is a waaay easier method, my teacher always is like "any teacher who teaches cast is ****" LOL but it's called General Solutions; if you want I can teach you it.
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    There's actually no need to use CAST diagrams; I never did. There's a much, much quicker way.
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    (Original post by coconut64)
    Hi again, if you have yo solve sin^2x=1, do you factorise it or square root it? Thanks
    Well you should see quite easily that sinx = ±1.
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    (Original post by PrimeLime)
    There's actually no need to use CAST diagrams; I never did. There's a much, much quicker way.
    Nor did I - never really grasped how they worked tbh

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    (Original post by Andy98)
    Nor did I - never really grasped how they worked tbh

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    Did you just do what I do: 180-solution for sine, 360-solution for cos etc.?
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    (Original post by PrimeLime)
    Did you just do what I do: 180-solution for sine, 360-solution for cos etc.?
    Yeah

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    (Original post by Michaelj99)
    Hey. I got 4 solutions? 294.1, 204.2, 114.2 and 24.2. I may be wrong, I haven't done this since my exams lool
    I believe this is CAST and there is a waaay easier method, my teacher always is like "any teacher who teaches cast is ****" LOL but it's called General Solutions; if you want I can teach you it.
    Yes please if you could.
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    (Original post by coconut64)
    Yes please if you could.
    I don't know whether you should learn this method. It'll likely make you forget how trig equations work.
 
 
 
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